Performance choking around 400 req/sec ???

[Cabbar Duzayak]

Ah, forgot to mention that this is on a Ubuntu 11.10 box.

On Thu, Apr 12, 2012 at 2:43 PM, Cabbar Duzayak <cabbar at gmail.com> wrote:
> Hi everyone,
>
> I should start by saying I am a newbie and have recently started using
> NGINX and VERYY happy with it. But, I have been trying to run some
> stress tests on NGINX (hitting a static file), and it looks like no
> matter what I do, server is choking at around 400 req/sec. Isn't this
> too low for a static file on NGINX? Am I doing something wrong?
>
> I have increased hard/soft limit to 30K/10K. My machine is reasonably
> powerful (quad-core i7 with 8gb RAM) and during the tests, CPU load is
> pretty low.
>
> I used apache bench to do performance testing and I am hitting a
> static file on local filesystem. I ran the test from 2 different
> machines (nginx is on the 3rd machine) and used the following command
> on each starting at the same time:
>
> ab -n 10000 -c 400 http://mydomain.com/static.html
>
> Results of one of these is below:
>
> Document Length:        29638 bytes
>
> Concurrency Level:      400
> Time taken for tests:   33.856 seconds
> Complete requests:      10000
> Failed requests:        0
> Write errors:           0
> Total transferred:      300038664 bytes
> HTML transferred:       297222704 bytes
> Requests per second:    295.37 [#/sec] (mean)
> Time per request:       1354.241 [ms] (mean)
> Time per request:       3.386 [ms] (mean, across all concurrent requests)
> Transfer rate:          8654.48 [Kbytes/sec] received
>
> Connection Times (ms)
>              min  mean[+/-sd] median   max
> Connect:        6  448 1276.7    113   21113
> Processing:   120  840 621.7    570    5980
> Waiting:        5  186 176.3    114    2200
> Total:        132 1288 1420.9    695   23143
>
> Percentage of the requests served within a certain time (ms)
>  50%    695
>  66%   1134
>  75%   1474
>  80%   1721
>  90%   3027
>  95%   3685
>  98%   4688
>  99%   6445
>  100%  23143 (longest request)
>
>
> Am I missing something here??? Relevant parts of NGINX Conf:
>
> worker_processes 6;
> worker_rlimit_nofile 30000;
>
> events {
>        worker_connections 1024;
>        # multi_accept on;
> }
>
> http {
>
>        sendfile on;
>        tcp_nopush on;
>        tcp_nodelay on;
>        keepalive_timeout 65;
>        types_hash_max_size 2048;
>        # server_tokens off;
>
>        # server_names_hash_bucket_size 64;
>        # server_name_in_redirect off;
>
>        log_format combined_perf '$remote_addr - $remote_user [$time_local]  '
>                                 '"$request" $status $body_bytes_sent '
>                                 '"$http_referer" "$http_user_agent" '
>                                 '[$request_time / $upstream_response_time]';
>
>        access_log /var/log/nginx/root/access.log combined_perf;
>        error_log /var/log/nginx/root/error.log error;
>
>        ##
>        # Gzip Settings
>        ##
>
>        gzip on;
>        gzip_disable "msie6";
> ……
> }
>
> Thanks a ton!